Surface Chemistry Test

Result

Surface Chemistry Test - 14

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Weekly Quiz Competition

Question 1
4 / -1

In homogeneous catalysis

A
the reactants, catalyst and products are in the same phase

B
the catalyst and reactants are in the same phase

C
the catalyst and products are in the same phase

D
the reactants and products are in the same phase

Solution
Question 2
4 / -1

Which of the following reaction is an example for homogeneous catalysis ?

A

B

C

D

Solution
Question 3
4 / -1

Identify the correct statement regarding enzymes.

A
Enzymes are specific biological catalysts that can normally function at very high temperatures (T ~1000 K)

B
Enzymes are normally heterogeneous catalysts that are very specific in their action

C
Enzymes are specific biological catalysts that cannot be poisoned

D
Enzymes are specific biological catalysts that possess well defined active sites
Question 4
4 / -1

Formation of ammonia from H₂ and N₂ by Haber's process using Fe is an example of

A
heterogeneous catalysis

B
homogeneous catalysis

C
enzyme catalysis

D
non-catalytic process
Question 5
4 / -1

Which of the following reactions is an example of heterogeneous catalysis ?

A

B

C

D

Solution
Question 6
4 / -1

Which of the following is an example for heterogeneous catalysis reaction ?

A

B
Hydrolysis of aqueous sucrose solution in the presence of aqueous mineral acid

C

D
Hydrolysis of liquid in the presence of aqueous mineral acid

Solution
Question 7
4 / -1

Peptisation involves

A
precipitation of colloidal particles

B
disintegration of colloidal aggregates

C
evaporation of dispersion medium

D
Impact of molecules of the dispersion medium on the colloidal particles
Question 8
4 / -1

Potassium stearate is obtained by the saponification of an oil or fat. It has formula CH₃ —(CH₂ )₁₆ —COOK. The molecule has a lyophobic terminal CH₃ and a lyophilic terminal—COOK. Potassium stearate is an example of

A
lyophilic colloid

B
lyophobic colloid

C
macromolecular colloid

D
micelle or associated colloid
Question 9
4 / -1

The coagulating power of electrolytes having ions Na⁺ , Al³⁺ and Ba²⁺ for arsenic sulphide sol increases in the order

A
Al³⁺ < Ba²⁺ < Na⁺

B
Na⁺ < Ba²⁺ < Al³⁺

C
Ba²⁺ < Na²⁺ < Al³⁺

D
Al³⁺ < Na⁺ < Ba²⁺
Question 10
4 / -1

Lyophilic sols are more stable than lyophobic sols because

A
the colloidal particles have negative charge

B
the colloidal particles have positive charge

C
the colloidal particles are solvent

D
None of the above